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Hydrometallurgical recovery of copper from the leach liquor of waste PCBs
Kumari Suruchi,Panda Rekha,Bawkar Shilpa Kalamani,Hait Jhumki,Yoo Kyoungkeun,Prasad Ranjit,Jha Manis Kumar 한국자원공학회 2024 Geosystem engineering Vol.27 No.2
The present work is focused on the recovery of pure copper metal from leach liquor of discarded printed circuit boards (PCBs) using solvent extraction and electrowinning techniques. Leach liquor containing copper was produced from PCBs of scrap computers using pretreatment followed by the leaching technique. The obtained leach liquor contained 19.35 g/L of copper and 6 M concentration of nitric media. From the obtained leach liquor, systematic solvent extraction and electrowinning studies were carried out for maximum extraction of copper, leaving other metals to be present as impurities. Various process parameters of solvent extraction viz. effect of pH, contact time, phase ratio, and so on were studied and optimized. McCabe–Thiele diagram was plotted, which shows that complete recovery of copper can be achieved in three stages using 40% LIX 84IC and O/A ratio 1/1 at equilibrium pH 2.2 in a mixing time of 20 min. The loaded copper was stripped using 10% H2SO4. The obtained strip solution containing 19.35 g/L Cu was electrowinned at the optimized condition, i.e., 8 hours’ time and 205 A/m2 cathode density with 99.99% current efficiency. 99.8% pure copper metal was obtained. The developed process is environmentally sustainable and has potential to be commercialized after scale-up studies.
Manab Kundu,Gopalu Karunakaran,Evgeny Kolesnikov,Voynova Elena Sergeevna,Shilpa Kumari,Mikhail V. Gorshenkov,Denis Kuznetsov 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.59 No.-
The hollow NiCo2O4 nano-spheres (∼300–500 nm) are synthesized by ultrasonic spray pyrolysis method and used as electrode for high-performance supercapacitor (SC) and lithium-ion battery (LIB). When used in SC application, the hollow NiCo2O4 deliver a specific capacitance of ∼1000 F g−1 even after 3000 charge–discharge cycles. In addition, as an anode material for LIBs, it exhibits admirable high capacity values of 763 and 516 mA h g−1 after 1000 cycles at a current density of 1500 and 3000 mAh g−1, respectively. The excellent electrochemical performance of this hollow NiCo2O4 nano-sphere indicates its potential applications for next generation SCs and LIBs.